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Customer Financing (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Oct. 29, 2011
Oct. 29, 2011
Apr. 30, 2011
Oct. 29, 2011
The Bank Of Tokyo Mitsubishi UFJ, Ltd. [Member]
Oct. 29, 2011
U.S. Bank Group [Member]
Aug. 12, 2011
Fifth Third National Bank [Member]
Oct. 29, 2011
Maximum [Member]
Customer Financing [Line Items]              
Maximum credit financed for equipment purchases for any one customer $ 0.4 $ 0.4          
Percentage of principal amount of financing contracts received       84.00%      
Percentage of principal amount of financing contracts held as collateral       16.00%      
Maximum holdback receivable       500 110 75  
Holdback receivable outstanding         75    
Financing contracts sold under ASC 860 63.1 135.8          
Current receivables of finance contracts not yet sold 49.2 49.2 78.5        
Unearned income 1.9 1.9 3.6        
Finance contracts receivable sold and outstanding 461.7 461.7          
Residual receivable $ 78.5 $ 78.5 $ 78.0        
Bad debt write-offs, percentage, maximum             1.00%